*{
  margin: 0;
  padding: 0;
}
.top {
  color: #000;
  text-decoration: none;
  margin: 10px;
  padding: 5px;

  display: inline-block;
}
.top:hover {
  color: white;
  background: green;
  border: 0px solid gray;
}
#scenter{
  margin: auto;
}
.st{
  margin: 7px;
  background: rgb(244,246,245);
  width: 300px;
  height: 414px;
  text-align: center;
  border: 1px solid #ececec;
}
.st img{
  height: 300px;
  width: 298px;
}
.st:hover{
  border: 1px solid darkgreen;
}
#scenter li{
  list-style:none;
  display: inline-block;
}
